| KANG Jung-Hoon,SEO MinHo,KWON Oh Youn,KIM Woong-Seo. 2013. Diel vertical migration of the copepod Calanus sinicus before and during formation of the Yellow Sea Cold Bottom Water in the Yellow Sea. Acta Oceanologica Sinica, 32(9):99－106 |
| Diel vertical migration of the copepod Calanus sinicus before and during formation of the Yellow Sea Cold Bottom Water in the Yellow Sea |
| Diel vertical migration of the copepod Calanus sinicus before and during formation of the Yellow Sea Cold Bottom Water in the Yellow Sea |
| Received:June 15, 2012 Revised:December 24, 2012 |
| DOI：10.1007/s13131-013-0357-6 |
| Key words:Yellow Sea Cold BottomWater (YSCBW) copepod Calanus sinicus developmental stages diel vertical migration (DVM) |
| 中文关键词: Yellow Sea Cold BottomWater (YSCBW) copepod Calanus sinicus developmental stages diel vertical migration (DVM) |
| 基金项目:The study on the impact of the Yellow Sea Bottom Cold Water Mass to the ecosystem (YES Coldwater: PE99165);part of the Korea-China cooperative project on the Yellow Sea Cold Water Mass. |
| Author Name | Affiliation | E-mail | | KANG Jung-Hoon | South Sea Environment Research Division, Korea Institute of Ocean Science & Technology (KIOST), 41 Jangmok1-gil, Jangmok-myon, Geoje 656-834, Republic of Korea | jhkang@kiost.ac | | SEO MinHo | South Sea Environment Research Division, Korea Institute of Ocean Science & Technology (KIOST), 41 Jangmok1-gil, Jangmok-myon, Geoje 656-834, Republic of Korea | | | KWON Oh Youn | South Sea Environment Research Division, Korea Institute of Ocean Science & Technology (KIOST), 41 Jangmok1-gil, Jangmok-myon, Geoje 656-834, Republic of Korea | | | KIM Woong-Seo | Deep-sea and Seabed Resources Research Division, KIOST, Ansan P.O. Box 29, Seoul 425-600, Republic of Korea | |
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| Abstract: |
| To understand the effects of the Yellow Sea Cold Bottom Water (YSCBW) on the diel vertical migration (DVM) of the copepod Calanus sinicus, we surveyed vertical distribution of C. sinicus at a fixed station in the Yellow Sea before (spring) and during (summer) formation of the YSCBW. Cold water (<10℃) was observed in the bottom layer when the water column was ther mally stratified in summer, but the water column was thermally well-mixed in spring 2010. Samples were collected from five different layers at 3-h intervals using an opening-closing net. Adult females (1-155 ind./m3) showed a clear normal DVM pattern throughout the entire water column in spring, whereas adultmales did notmigrate. DVM of copepodite V (CV) individuals was not clear, but the maximum abundance of CI-CIV occurred consistently in the upper 10-20 m layer, where there was a high concentration of chlorophyll-a (Chl-a) (0.49-1.19 μg/L). In summer, weak DVM was limited to coldwaters beneath the thermocline for adult females (<30 ind./m3), but not for adult males. The maximum abundance of CI-CIV also occurred consistently in the subsurface layer (20-40 m) together with high concentrations of Chl-a (0.81-2.36 μg/L). CV individuals (1-272 ind./m3) moved slightly up ward nocturnally to the near-surface layer (10-20 m), where the average temperature was 25.74℃, but they were not found in the surface layer (0-10m; 28.31℃). These results indicate that the existence of the YSBCW affected food availability at depth and the vertical temperature distribution, leading to variation in the amplitude and shape of stage-specific vertical distributions (CI to adults) in C. sinicus before and during the formation of cold waters in the Yellow Sea during the study period. |
| 中文摘要: |
| To understand the effects of the Yellow Sea Cold Bottom Water (YSCBW) on the diel vertical migration (DVM) of the copepod Calanus sinicus, we surveyed vertical distribution of C. sinicus at a fixed station in the Yellow Sea before (spring) and during (summer) formation of the YSCBW. Cold water (<10℃) was observed in the bottom layer when the water column was ther mally stratified in summer, but the water column was thermally well-mixed in spring 2010. Samples were collected from five different layers at 3-h intervals using an opening-closing net. Adult females (1-155 ind./m3) showed a clear normal DVM pattern throughout the entire water column in spring, whereas adultmales did notmigrate. DVM of copepodite V (CV) individuals was not clear, but the maximum abundance of CI-CIV occurred consistently in the upper 10-20 m layer, where there was a high concentration of chlorophyll-a (Chl-a) (0.49-1.19 μg/L). In summer, weak DVM was limited to coldwaters beneath the thermocline for adult females (<30 ind./m3), but not for adult males. The maximum abundance of CI-CIV also occurred consistently in the subsurface layer (20-40 m) together with high concentrations of Chl-a (0.81-2.36 μg/L). CV individuals (1-272 ind./m3) moved slightly up ward nocturnally to the near-surface layer (10-20 m), where the average temperature was 25.74℃, but they were not found in the surface layer (0-10m; 28.31℃). These results indicate that the existence of the YSBCW affected food availability at depth and the vertical temperature distribution, leading to variation in the amplitude and shape of stage-specific vertical distributions (CI to adults) in C. sinicus before and during the formation of cold waters in the Yellow Sea during the study period. |
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